Verify the Integration Formula $$\int 9 \operatorname { sech } x d x = \tan ^ { - 1 } ( \sinh 9 x ) + C$$

question 13

True/False

Verify the integration formula.
- $$\int 9 \operatorname { sech } x d x = \tan ^ { - 1 } ( \sinh 9 x ) + C$$

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